Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 275mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke275 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75S
The AirTAC SAIJ125X275-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a 125 mm bore and a 275 mm nominal stroke that can be dialed back by up to 75 mm, creating a usable travel window of 200 to 275 mm. This built-in adjustability allows operators to fine-tune end positions during commissioning or product changeovers without physically swapping the cylinder or adding external stops. In the 125 mm bore class, it delivers 6136 N of pull force at 0.5 MPa and up to 11045 N at 0.9 MPa, making it suited for heavy positioning tasks.
This variant includes a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and a magnetic piston (-S) for position sensing. The extruded aluminum barrel features sensor grooves on both sides, accepting AirTAC CMSE reed switches or DMSE solid-state sensors. It uses PT tapered G1/2 ports and offers variable air cushions at both ends to manage kinetic energy. The rear adjuster functions purely as a travel stop for deceleration and positioning; it is not a locking mechanism, so the cylinder cannot hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 275 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×275 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75S Is Used
Variable End-Stop Positioning
Dial in the exact retraction point between 200 and 275 mm during machine setup to accommodate different material thicknesses without changing hardware.
Product Size Changeover
Rapidly adjust the stroke window on packaging or filling lines when switching between product formats, minimizing downtime between production runs.
Commissioning Fine-Tuning
Use the rear stopper screw to precisely set the end-of-stroke deceleration point during initial commissioning, avoiding the need for external stop blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75S the Right Cylinder?
Choose this 125 mm bore when an application requires heavy thrust that exceeds the 3927 N push force of a 100 mm cylinder at 0.5 MPa, but does not necessitate stepping up to a 160 mm model that generates 10053 N. The 75 mm adjustment range is ideal for machinery processing multiple product sizes on a single line, as the end-of-stroke position can be adapted on the fly. For load-holding without continuous air pressure, an external pilot-operated check valve or a related AirTAC locking cylinder like the SAIL or BSAI is required, as the SAIJ adjuster only acts as a stop.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 275 mm stroke, 75 mm adjustment range, PT G1/2 port thread, and the -S magnet requirement. Because the stroke is 275 mm, the 32 mm piston rod and M27x2 rod thread provide substantial rigidity, but long unsupported travel still necessitates an external guide to prevent side-loading damage. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR configurations.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX275-75S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of pull force and 8590 N of push force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that allows you to shorten the 275 mm nominal stroke by up to 75 mm, resulting in a usable travel window of 200 to 275 mm. It sets the end position but does not lock the load without live air pressure.
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